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Light polorisation
Polariscope

Polariscope: Principle

Polariscope: how to use it

Polariscope:help to  discriminate betwen singly and doubly refractive gems, determinate optic character uni of bi axial and pleochroism
Polariscope: how to use it. Place the stone between 2 cross polarised filter.

Polariscope: singly refractive and agregate gems

Polariscope: double refractive and strain anisotropy

Polariscope: isotropic examples

If it's all black it's a singly refractive gem, ift it's all white you have an agregate gem
Polariscope: double refractive visible every 90° and strain anisotropy if irregular exctinction
Polariscope: isotropic examples always black garnets, spinels, natural glass, fluorite, diamonds, opals and plastics

Polariscope: anisotropic examples

Polariscope: strain anistropy

Polariscope: Polycrystalline gems

Examples Beryl, chrysoberyl, corundum, feldspar, Peridot, Quartz, topaz, tourmaline, diopside, tanzanite, kunsite, and zircon
Examples Beryl, chrysoberyl, corundum, feldspar, Peridot, Quartz, topaz, tourmaline, diopside, tanzanite, kunsite, and zircon
Strain anistropy, examples: almandine garnet, amber, some diamonds, Verneuil sapphires, some plastic gems and some opals
Polariscope: Polycrystalline gems examples: jadeite, nephrite, chalcedony, agates, twin anomalies sapphire, ruby doublets and Hessonite garnets
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